Abstract
The condition for the appearance of ferromagnetism for Ni, Pd and Pt metals is investigated in the molecular field approximation through the calculation of the spin paramagnetic susceptibilities on the basis of the energy bands given by Friedel et al. . It is concluded that the effect of the spin-orbit interaction is insufficient to support the fact that ferromagnetism appears only in Ni metal and it does not appear in Pd and Pt metals. This fact is supported by three contributions; the difference of the molecular field, the number of the d holes and the effect of the spin-orbit interaction for the respective metal. These three contributions are nearly the same with each other in their effects.
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